Tbeeitoey



(No Model.)

A. D. KILBORN.

. SAFETY VALVE.

Patented Ma.1.27,18|83.

UNITED STATES PATENT OFFICE.

ALDEN D. KILBORN, OF TUCSON, ARIZONA TERRITORY.

SAFETY-VALVE'.

SPECIFICATION' forming part of Letters-Patent No. 274,787, dated March27, 1883.

2 Application filed January 1.5, 1883. (No model.)

To all whom it may concern Be it known that I, A. l). KILBORN, ofTucson, in the county of Pima and Territory of Arizona, have inventedcertain new and useful Improvements in Safety-Valves; and I do herebydeclare that the following is afull, clear, and exact description of theinvention, lwhich will enable others skilled in the art to whichitappertains to make' and use the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon,which form part of this specification. My invention has for its objectto provide a more simple and effective safety-valve for steam-boilersgenerally than those now in use. It consists in devices by which thevalve is held to its seatby means of a spring, with means foradjustingthe tension of the spring, the parts being located within ashell o r casing, and the adjusting devices being so connected that thevalve can be removed from the boiler for inspection, repairs, or thesubstitution of a new valve, without interfering with or altering thetensionat which the spring is set, in combination with an automaticcushioning-valve, whereby said valve is prevented from battering.

Itfurther consists in the construction and arrangement of the cup-shapedregulating def vice, whereby the tension of the spring is regulated andsealed, in tral spindle and spring holding-disk, said spindle beingadapted to hold the spring-disk and cup with the case in the positiontowhich it isset while detached from the boiler, as described. v

Figure lis a vertical section of my improved safety-valve. Fig.- 2 is avertical detached perspective view of the cage or casing. Fig. 3 is aperspective view of the perforated cup.- cap, clearly showing theelongated aperture for the sealing thereof to the casing. Fig. 4 is aninverted perspective View of the valve;

Fig. 5, a detached view of the double screwthreaded thimble or socket,one end of, which screws into the boiler andthe other end into the cageor casing, and whose upper end forms the valve-seat 5 and Fig. 6 shows aplan view of the spindle and disk `upon which the spiral springoperates.

A is the base, to which the shell or cap C is combination with thecenattached by means of the screwthreads c. The upper end of thebaseforms a fiat seat, b, upon which the valve B works; and to permit a freemovement ofthe valve when discharging steam or allpw it to be readilyseated, I provide a spindle, F, having on it near its lower end a disk,D, upon which one end of the spring E is seated; the lower end of thespindle, passing through the disk, enters a cavity formed in the topofthe valve, and its upper Vend is screwthreaded to receive a nut forretaining the structure in position when removed from the boiler. Theinner and upper end of the shell or casin g is screw-threaded, toreceive the cupshaped perforated nut or cap G. This nut is to regulatethe tension of the spring, the upper part of which rests against thenut. The center perforation serves as a guide for the stem or spindle F.The other perforations or holes, H, around the centerare to permit thefree escape of the steam, and at the same time to muftle it and toprevent the disagreeable noise thereof. On the upper end of the case isa series of holes, K, and on the side of the nnt is an elongated hole,I. After the tension of the spring has been adjusted to allow the valveto open at a predetermined pressure, the holes I and K are made toregister with each other, when a piece of wire is inserted! and theirends sealed together, thereby preventing any tampering with theadjustment of the valve. By placing the end of'a properlyformed wrenchin the holes in the cap `it may be screwed up or down, thereby adjustingthe spring to any desirable degree of tension. The valvehas double seatsand a at face providedwith a recess, the face corresponding to thatofthe seat. The area of the valve exposed tothe steam-pressure being muchgreater when open than lwhen closed, the pressure in the boiler willtherefore fall below the pressure that opens the valve before the valvecloses. On the face ofthe valve is an annular recess, in vwhich is justbefore the valve is seated, thereby cushioning it and preventing thevalve from battering.

It will vbe seen by the above description and drawing that the device issimple in its construction and readily taken apart and examconfined `aportion of the steam.

IOO

ined without interfering with the tension-ade O justin g device of thespring, and which is held together by serewiugthe nut on top ot' thespindle tothe proper position.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, lsl 1. In a safety-vulve, the combination, with theinternally-screW-threaded shell, of the perforated cup-shaped nut, thespring, and the valve, substantially as shown and described.

2. In a safety-valve, the combination, with theshell, ofthe perforatedcup-shaped nut, the

spindle provid ed with a disk, the spring, and the' valve, substantiallyas shown and described.

3. In a safety-valve, the combination, with the shell having a series ofperforations near its upper end, ofthe perforated nut having anelongated hole in its side, the seat, the spring,

and the valve, substantially as shown and described.

4. The combination, in a safety-valve, of the casing, constructed asdescribed, the spindle having` a disk on one end and a screw-uut uponthe other, with the cup-shaped nut, and spring interposed between saidnut and disk, wlereby the above parts are secured to each other whendetached from the boiler, and the tension of the spring does not requireresetting, as described.

In testimony that I claim the foregoing as my own I affix my signaturein presence of two witnesses.

ALDEN DAVID KILBORN. Witnesses WM. W. FOSTER, CEAS. F. DODGE.

